名词
中文翻译：活塞环
同义词：
['piston ring', 'piston seal', 'cylinder head gasket']
例句：
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1. The engine needs to be cleaned regularly to keep the piston rings in good condition.
发动机需要定期清洁，以保持活塞环的良好状态。
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2. The engineer replaced the worn piston rings with new ones to improve efficiency.
工程师用新的活塞环替换了磨损的活塞环，以提高效率。
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3. During maintenance, the technician checked the piston rings for any signs of wearor damage.
在维护期间，技术人员检查活塞环是否有磨损或损坏的迹象。